Radioactive isotopes called can be used to detect some medical problems.
a. beta particles
b. tracers
c. gamma radiation
d. alpha particles

b. tracers

Explanation:

Radioactive isotopes are the chemical substances which consists of elements which exhibit atoms with unstable nuclei. The unstable nuclei when split or decay results in release of energy in the form of radiation in the form of alpha, beta, and gamma rays.

The tracers are the radioactive isotopes which are used to resolve the medical problems. The tracers are introduced in the body of the patients which when split or decays is tracked by the cameras. This process helps in detecting the cause of diseases and disorders.

the equation that correctly represent the reaction for formation of ammonia is

n2+ 3h2 → 2nh3 (answer d)

1 mole of nitrogen gas (n2) react with 3 moles of hydrogen gas (h2) to form 2 moles of ammonia ( nh3). this is in a process known as haber process were iron is used as a catalyst and reaction take place that a higher temperature and pressure. the process is exothermic hence energy is released.

both adhesion and cohesion are attractions.

they are different in that adhesion is the force of attraction between the molecules of two different substances, whereas cohesion is the force of attraction between molecules of the same substance.

possible examples include capillary action, in which the adhesion between water and glass causes the water to rise in a narrow tube against the force of gravity.

because of hydrogen bonding, water is extremely cohesive.

this causes molecules on the surface of water to be drawn inward, which is why drops of water form beads on smooth surfaces.

hope this .